Chair



i UNITED. STATES PATENT OFFICE.

GEORGE E.v UNDERHILL, OF BBIDGEPOBT, CONNECTICUT.

CHAIR.

SPECIFICATION forming part 'of Letters Patent No. 351,671, dated ctober 26, 1886.

Application filed September 28, 1885. Serial No. 178,394. (No model.)

To all whom it 11mg/ concern:

Be it known that I, GEORGE E. UNDERHILL,

. ing the chair with the proper adjustment, by

means of which the seat is brought to its true level or horizontal position.

My invention consists of a base-piece resting on the door and having an adjustable chairsupport attached thereto.

To more clearly understand my invention, reference is had to the drawings, and to the gures and letters of reference marked theref on, forming part of this speciiication.,

Figure I represents a side elevation of the l device with a chair attached thereto, also a section of the floor. Fig. II represents a sectional view through the dotted line as of Fig. Fig. III represents a front elevation and section of door. Fig. IV represents a section and rear elevation through the dotted line of Fig. III. Fig. V represents a side elevation of the chair-support. Fig. VI represents a sectional view through the line x, and section through line x of Fig. III.

Its construction and operation are as follows:

A is the base-piece; B, the chairsupport attached thereto; a, ears or lugs on said support; b, lugs of the chair. C is the chair; D, seat; E, supporting-leg; F, section of door.`

The device as shown is attached to a chair adapted to be folded. The chair does not form a part of the improvement, and is shown .only to illustrate my invention.

My improvement consists in attaching th adjustable chair-support B (see Fig. I) to the base-piece A, and projecting at right angles from support B are the lugs or ears a, which are connected to the lugs b of the chair by the bolt c, thus forming a hinge, enabling the chair to swing laterally thereon. The upper portion, e, of `the base-piece A represents anVV arc of a circle, as shown more clearly at Fig. II.

On the side f of the support B is also described the saine circle, the two parts iitting together. The ribs g g of base-piece A (see Fig. III) project outward from the surface, and operate to keep the support Bin position. F (see Fig. I) represents an inclined iioor. The dotted line h will represent the true/level. The line z' from the point l to e is the radius of the circle of base-piece A and support B. When the base A, with the chair attached, is placed on the floor, the support B is raised or lowered, as the case may be, moving in the circle, as 4before mentioned, until the seat D of the chair is brought to the true level, which will bewhen the seat D is parallel with line h and the line j at right angles therewith. In other words,

the lines 71J t j kwill represent the four sides of a parallelogram. To show more clearly its operation on floors havinga different pitch, we will suppose the base-piece A, with support B, after having4 been properly adj usted for po-v sition, as represented in Fig. I, is placed on the level iioor G, as seen at Fig. II. Then the line t' of Fig. I will be in the position as represented by i', Fig. II, and to compensate for the difference between the two iioors the support B will have to be raised until the line z" is parallel to the floor G and the linej at right angles thereto. When properly adjusted, the bolt d secures the support firmly to the base A. The slot Z in the base A (see Fig. IV) allows sufficient range for the travel ot' the support B, so as to secure itin any position required. v

Raising or lowering the support B (see Fig. I) will, as before stated, place the chair-seat D iu any position required.

As b'efore mentioned, the circles of the basepiece A and support B are described from the point -1 below the seat D. The exact radius of these circles is immaterial, although there is a position for the center and length of radius that would give practically the best results. For instance, if the center l were carried up higher than its present position, it would necessitatethe lengthening ofthe base-piece A. Itis therefore desirable to keep this as near the floor as possible to avoid giving it a clumsy appearance. A very short radius, causing the support B to describe a small circle, would interfere with the proper elevation of said support necessary to bring the seat to its level.

IOS)

In Figs. I, II, III, IV, and V, the circulaiface of the chair-support and base-piece are represented smooth. The broad surface thus brought in contact, in connection with the bolt b, might be sufficient under any circumstances to prevent accidental slipping; but to prevent any possibility of this occurring, I propose to corrugate the circular faces of the chairsupport and base-piece, as seen in the sectional view, Fig. V I. These corrugations will be sufficiently coarse to preclude any possibility of the support shifting after being properly placed in position, and yet fine enough to nicely adjust it to the exact height.

The leading feature of my invention consists of a chair-support, to which the chair proper is secured. Said support is attached to a base-piece or supporting-standard and adapted to be adjusted, to the end that the seat may be brought to its true level to compensate for the incline or pitch of door.

I am aware of Patents No. 241,7 28, May 17, 1881, and-No. 157,753, December 15, 1874, and do not claim the construction therein shown and described.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. As an improvement in chairs to compensate for the incline or pit-ch of floors, the combination, with an upright standard or basepiece ixed to the door, one of its perpendicular sides having a curvilineal face, of an adj ustable supporting frame or block, and means provided thereon to connect it with the seat or chair, said block having a curvilineal face to engage with the curvilineal face of thestandard, and means provided to secure the same thereto, substantially as described.

2. As an improvement in chairs to compensate for the incline or pitch of the floor, the upright standard A, having the circular or curvilineal face c of the adjustable frame or block B, having circular' facef to engage with the circular face of the standard, and means provided to secure said frame thereto, and means provided t0 secure said frame to the chair or seat, so that the seat may be brought to its true level, substantially as described and set forth.

3. The base-piece A, having corrugated cir cular recess c, adapted to enga-ge and hold in position the chair-support B, having corrugated facef, and means provided on said support to connect the chair therewith, substantiall y as described and set forth.

.L. The combination, with the single upright standard A, having circular face e, ribs y, elongated slot l, of the adjustable frame B, having circular i'acej'to engage the circular face of 6o the standard, bolt d, to secure the same thereto, lugs a, and bolt c, to secure said frame to the seat or chair, substantially as shown and set forth.

Signed at Bridgeport, in the county of Fairfield and State of Connecticut, this 15th day of September, A. l). 1885.

GEORGE E. UNDERHILL.

Vitnesses:

JOHN SCHMERMONTH, J. B. KLEIN. 

